PPO/PPE (modified)

PPO/PPE (Modified Polyphenylene Oxide)

Low moisture absorption, good electrical properties and dimensional stability, high heat deflection temperature.

Processing temperatures

Melt (injection) temperature280 °C
Mold surface temperature90 °C
Ejection temperature122 °C

Typical values. They vary (±) with grade and manufacturer; see the data sheet.

Physical properties (typical)

Density1.06 g/cm³
Shrinkage (flow / cross)0.6 / 0.6 %
Specific heat1.4 kJ/kg·K
Thermal conductivity0.22 W/m·K

Drying

Drying is recommended.

For exact conditions see the material data sheet. Drying guide →

Points to watch

  • High melt viscosity, high pressure
  • Stress cracking

Typical use: Pump housings, electrical connections, automotive

Defects common with this material

Splay (silver streaks)

Fine silvery streaks on the part surface in the flow direction.

splay · silver streaks · moisture streaks

Brittleness / low impact strength

The part breaks more easily than expected; sometimes the surface looks fine.

brittleness · brittle part · cracking

Warpage

The part distorts or bends after it leaves the mold.

warpage · distortion · bowing

Sink mark

A dent on the surface opposite a thick section; the surface is drawn inwards.

sink mark · depression · sink

Dimensional variation and shrinkage differences

Part dimensions fall outside the tolerance or vary from cycle to cycle.

dimensional error · shrinkage · out of tolerance

Short shot (incomplete fill)

The cavity does not fill completely; the farthest or thinnest area of the part stays incomplete.

incomplete fill · underfill · non-fill

Other grades in the same family

PPO + GF30

Amorphous300 °C melt · 95 °C mold

Do the values for this material not match your grade? and we will correct them.